R6 methods no longer recommends initialize or .__enclos_env__ in autocomplete.

The deprecated lock parameter has been removed.

R6Class() now prints a message when a finalize method is public instead of private.

When a superclass is not cloneable, then subclasses cannot be cloneable (@IndrajeetPatil, #247).

Fixed #253: Errors could occur when deep cloning if a member object was an environment with a class that had a $ method. Deep cloning now uses get0() instead of $. R6 now requires R >= 3.2. (@zeehio, #274)

Resolved #195: Slightly clearer message when there is an error in the initialize() method.

Fixed #214: When a non-portable object inheritance was cloned, methods that were inherited (and not overridden) had the wrong environment. (#215, #217)

Printing R6 objects, no longer includes .__active__.